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Figure 2: Histopathology of solitary tracheobronchial papillomas; a) Papilloma lined by squamous epithelium (Case 5, ×10 magnification; H and E stain); b) Papilloma lined by glandular epithelium (Case 3, ×10 magnification; H and E stain), with ciliated columnar cells (inset, ×40 magnification); c) Squamous epithelium with low-grade dysplasia (Case 5, ×20 magnification; H and E stain); d) Squamous epithelium with high-grade dysplasia (Case 1, ×40 magnification; H and E stain)

Figure 2: Histopathology of solitary tracheobronchial papillomas; a) Papilloma lined by squamous epithelium (Case 5, ×10 magnification; H and E stain); b) Papilloma lined by glandular epithelium (Case 3, ×10 magnification; H and E stain), with ciliated columnar cells (inset, ×40 magnification); c) Squamous epithelium with low-grade dysplasia (Case 5, ×20 magnification; H and E stain); d) Squamous epithelium with high-grade dysplasia (Case 1, ×40 magnification; H and E stain)